[填空题]
A right pyramid has apex lh l;y e6nx,)qaunw0mes8 0)s V and square base ABCD. a.yfdrrc4li6 )w ;,uir v5q)cThe vertical height of the pyramid, VM, is 5 cm.5aidf4)vcwl u ;,cryrr i6 q.) The sloping edges are 8 cm long.
1.Calculate the length of MC. cm
2.Calculate the size of the angle that sloping edge VC makes with the
vertical height of the pyramid. $^{\circ}$
3.Calculate the area of the triangle ABC. $cm^2$